Heat transfer

This experiment will be done at 4 different stations

Station 1. Conduction

Note that each of the 4 metal strips is made from a different metal. Identify each of the metals and look at their Thermal Conductivity Coefficient.

Place a bead of wax from the candle in the indented cavity at the end of each of the 4 metal strips.

Use the retort stand to raise the cross above the candle height

Use the Thermal Conductivity Coefficients to predict what will happen once the candle is lit and left heating the metals for 5 minutes.

Light the candle, place it under the cross in the middle at a height of about 1 cm above the metals and start the stopwatch simultaneously.

Record your Observations and note how long each bud of wax takes to melt.

source: https://thermtest.com/materials-database

Questions

    1. How did your predictions fair?

    2. How does the heat energy move through the metal?

    3. Why do some metals transfer heat differently to others?

Station 2. Radiation

You will use a Leslie cube. This is a cube with four painted sides, White, Black, copper and silver. You will use a thermometer through the top of the polystyrene lid to measure the temperature.

Predict what might happen when you record the temperature from each painted side. Will there be a change? If so what will be the difference?

Using the gun thermometers, measure the temperature of the outer surface of each colour and note the temperature of the air inside using the Vernier Probe

Question

    1. Which side radiated heat more?

    2. Which was the least

    3. Explain your results

    4. How does this relate to black body radiation?

Station 3. Convection Currents

You will be provided with coloured water ice cubes.

Using the 250 ml beaker fill it with about 1 cm from the top.

Using the 500 ml beaker, place the 250 ml into it.

You will place the ice cube into the 250 ml beaker and poor a small amount of hot water into the bottom of the 500 ml beaker

Take some shots at the very start.

Observe and take some photos, or a video as things change

Annotate the shots you have taken to explain what is going on.

    1. Use your understanding of convection to explain what you saw.

    2. How does this relate to the convection currents in the Earth’s mantle?

Station 4. Convection

Perform the TEABAG Rocket (you teacher will demonstrate)

Record your Observations

    1. How does this demonstrate Convection of Heat? Draw a diagram with your explanation.

    2. How is this related to how a hot air balloon works?

    3. If the hot air in balloon is contained, how is it able to rise?

Conclusion

Make a concluding statement that links your results to the content under study.